Figure shows schematic plan of blood circulation in humans with labels A to D. Identify the label and give its function/s.

1. A. A – Pulmonary vein – takes impure blood from body parts, P O 2 =60 mm Hg
2. B. B – Pulmonary artery – takes blood from heart to lungs, P O 2 =90 mm Hg
3. C. C – Vena Cava – takes blood from body parts to right auricle, P CO 2 =45 mm Hg
4. D. D – Dorsal aorta – takes blood from heart to body parts, P O 2 =95 mm Hg

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